Donna came with luggage. This was a first for the Doctor, who was used to his companions joining him on more of a spur-of-the-moment basis. Donna, however, came with multiple suitcases. And also with hats. And a healthy dose of cynicism that bordered on suspicion. He could hardly blame her. Her world had, for all intents and purposes, been turned upside down in the past several days. All things considered she was handling it remarkably well.
He showed her to a room, which they discovered was decked out to the nines in the style of a fancy hotel. Large four poster bed, fluffy white duvet, thick rug beneath their feet, and even a robe. Donna made delighted noises and eagerly looked around.
"Well," he said, clearing his throat. "I'll leave you to get settled in, then." He turned and headed for the door.
"Does the door lock?" Donna asked him pointedly.
"What?" He spun around to face her.
"The door to my room," Donna said, hand on her hip. "Does it lock?"
"Well yes," he said, befuddled. "But there's no need to worry about it. There's no one here except you and me."
Donna looked at him for a long beat, one eyebrow raised.
"Oh for goodness sake," he said, catching her meaning. "I told you! I meant I wanted a mate. I have no interest in – oh forget it. Yes the door locks." He demonstrated the mechanism to her and stalked out. No need to tell her that he could always enter any room on the ship if he truly needed to.
Not that he planned to, anyways. He still wasn't quite sure what he had been thinking, asking this one on board. She was loud and brash and all around infuriating, half of the time. He wasn't sure that they wouldn't kill each other by the end of their first week together.
He was bemused to note that Donna, for what it's worth, slept like a baby. The only one of his companions to date to settle right in and make it through their first night as if they were safe at home.
Who would've figured, he thought to himself.
Maybe he should tell them all to lock their doors.